What are Category 4 sunglasses?

What are Category 4 sunglasses?

Category 4 is typically a very dark grey or brown lens – ideal in mountains or desert where the sun is intense and there are high glare conditions. They are not to be used when driving as the density of tint can make it dangerous to do so. All the Category 4 sunglasses we sell are clearly described as such.

What does uv400 mean?

The designation UV400 with guaranteed UV protection protects against harmful UV-B and UV-A radiation. Furthermore, the sunglasses reduce visible light, which makes seeing in the sunshine more pleasant. In short, the term UV400 means that the glasses absorb UV-A, B and C rays, up to a wavelength of 400 nanometers.

Which lens material is best for sunglasses?

These are a good choice for kids sunglasses, sports and outdoor activities, and safety glasses. Nylon, or polyamide, is a newer top-notch performance material, it combines the advantages of polycarbonate and CR-39 lenses.

Why do we wear sunglasses?

The American Optometric Association says you should always don sunglasses during the daylight hours because: They protect your eyes against the sun's UV rays, which could otherwise lead to cataracts. They protect against "blue light" from the solar spectrum, which could increase your risk of macular degeneration.

What’s polarized mean?

Polarized sunglasses provide superior glare protection — especially on the water. Polarized lenses have a special filter that blocks this type of intense reflected light, reducing glare and discomfort.

How do I choose sunglasses?

The biggest sign that sunglasses are men's is that the bridge, the piece that sits over the nose, is wider. Likewise, the arms on men's sunglasses are typically longer than on women's sunglasses because men have wider faces. Men's sunglasses also have more straight lines than women's.

Do sunglasses protect eyes?

Sunglasses are a great fashion accessory, but their most important job is to protect your eyes from the sun's ultraviolet (UV) rays. Some of the sun's effects on the eyes include: Cataracts, a clouding of the eye's lens that can blur vision.

What does CE on sunglasses mean?

If your product meets the standards, it can bear a CE marking and be sold in the EU. CE stands for Conformité Européenne, which is French for "European Conformity."

What are sunglasses made of?

Sunglasses consist of a pair of light-filtering lenses and a frame to hold them in place. The vast majority of lenses are made of colorized plastic, such as polycarbonate. However, glass is still employed for high quality brands.

How can I tell if my sunglasses have UV protection?

Sometimes the word wayfarer is used to describe someone who doesn't simply go on a hike, but who always seems to be restless, especially a journeying literary character. One of the most well-known, classic brands of sunglasses is the Ray-Ban Wayfarer, in production since the early 1950s.

Where are sunglasses made?

Approximately 95 percent of eyeglass frames are made outside of America with more than 90 percent produced in China, the land of inexpensive labor. The Luxottica Group, based in Milan, Italy, controls more than 80 percent of the world's major eyewear brands.